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US12401556B2ActiveUtilityPatentIndex 52

EHT-LTF sequence transmission method and related apparatus

Assignee: HUAWEI TECH CO LTDPriority: Jul 31, 2020Filed: Jan 30, 2023Granted: Aug 26, 2025
Est. expiryJul 31, 2040(~14.1 yrs left)· nominal 20-yr term from priority
Inventors:LIU CHENCHENLIANG DANDANGAN MING
H04W 84/12H04L 27/2603H04L 27/26132H04L 27/262H04L 27/2613
52
PatentIndex Score
0
Cited by
10
References
20
Claims

Abstract

A method for transmitting an extremely high throughput long training field (EHT-LTF) sequence includes: A first communication device generates and sends an extremely high throughput physical layer protocol data unit (EHT PPDU), where the EHT PPDU includes an EHT-LTF; and correspondingly, a second communication device receives the EHT PPDU, and parses the EHT-LTF in the received EHT PPDU. In this way, an LTF sequence can be designed for the IEEE 802.11be standard, and a PAPR value of the LTF sequence on a resource unit can be reduced.

Claims

exact text as granted — not AI-modified
What is claimed is: 
     
       1. A method for transmitting an extremely high throughput long training field (EHT-LTF) sequence, comprising:
 generating, by a first communication device, an extremely high throughput physical layer protocol data unit (EHT PPDU), wherein the EHT PPDU comprises an EHT-LTF; and 
 sending, by the first communication device, the EHT PPDU, 
 wherein a 2x EHT-LTF sequence in an 80 MHz bandwidth is calculated according to the following equation:
 2xEHT-LTF80 MHZ=[2xHE-LTF80 MHz_part1, 2xNew_partA, 2xHE-LTF80 MHz_part2_Reverse, 2xNew_partB, 2xHE-LTF80 MHz_part4_Reverse, 2xNew_partC, 2xHE-LTF80 MHZ_part5], wherein 
 2xNew_partA is equal to [1, 0, −1, 0, 1], 2xNew_partB is equal to [0, 1, 0, −1, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, −1, 0, 1, 0, −1, 0, 1, 0], and 2xNew_partC is equal to [−1, 0, 1, 0, 1]; and 
 2xHE-LTF80 MHz_part2_Reverse indicates that 2xHE-LTF80 MHZ_part2 is arranged in a reverse order, and 2xHE-LTF80 MHz_part4_Reverse indicates that 2xHE-LTF80 MHz_part4 is arranged in a reverse order, 2xHE-LTF80 MHz_part1 is equal to 2xHE-LTF80 MHz (−500:−259), 2xHE-LTF80 MHz_part2 is equal to 2xHE-LTF80 MHz (−258:−17), 2xHE-LTF80 MHZ_part4 is equal to 2xHE-LTF80 MHZ (17:258), and 2xHE-LTF80 MHz_part5 is equal to 2xHE-LTF80 MHZ (259:500); 
 
 wherein a 4xEHT-LTF sequence in an 80 MHz bandwidth is calculated according to the following equation:
 4xEHT-LTF80 MHZ=[4xHE-LTF80 MHZ_part1, 4xNew_partA, 4xHE-LTF80 MHz_part2_Reverse, 4xNew_partB, 4xHE-LTF80 MHz_part4_Reverse, 4xNew_partC, (−1)*4xHE-LTF80 MHz_part5], wherein 
 4xNew_partA is equal to [−1, −1, −1, −1, 1], 4xNew_partB is equal to [1, −1, −1, −1, 1, 1, −1, 1, −1, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, −1, 1, 1], and 4xNew_partC is equal to [−1, 1, −1, 1, −1]; and 
 4xHE-LTF80 MHz_part2_Reverse indicates that 4xHE-LTF80 MHz_part2 is arranged in a reverse order, and 4xHE-LTF80 MHZ_part4_Reverse indicates that 4xHE-LTF80 MHz_part4 is arranged in a reverse order, 4xHE-LTF80 MHz_part1 is equal to 4xHE-LTF80 MHz (−500:−259), 4xHE-LTF80 MHz_part2 is equal to 4xHE-LTF80 MHz (−258:−17), 4xHE-LTF80 MHz_part4 is equal to 4xHE-LTF80 MHZ (17:258), and 4xHE-LTF80 MHz_part5 is equal to 4xHE-LTF80 MHZ (259:500); 
 
 wherein a 2xEHT-LTF sequence and a 4xEHT-LTF sequence in an 80 MHz bandwidth are calculated respectively according to the following equations:
 2xEHT-LTF80 MHz=[2xHE-LTF80 MHZ_part1, 2xHE-LTF80 MHz_part2_Reverse, 2xHE-LTF80 MHZ_part3, 2xHE-LTF80 MHz_part4_Reverse, 2xHE-LTF80 MHZ_part5]; and 
 4xEHT-LTF80 MHZ=[4xHE-LTF80 MHz_part1, 4xHE-LTF80 MHz_part2_Reverse, 4xHE-LTF80 MHZ_part3, 4xHE-LTF80 MHz_part4_Reverse, 4xHE-LTF80 MHz_part5], 
 wherein 2xHE-LTF80 MHz_part2_Reverse indicates that 2xHE-LTF80 MHz_part2 is arranged in a reverse order, and 2xHE-LTF80 MHz_part4_Reverse indicates that 2xHE-LTF80 MHz_part4 is arranged in a reverse order, 2xHE-LTF80 MHz_part1 is equal to 2xHE-LTF80 MHz (−500:−259), 2xHE-LTF80 MHz_part2 is equal to 2xHE-LTF80 MHZ (−258:−12), 2xHE-LTF80 MHz_part3 is equal to 2xHE-LTF80 MHZ (−11:11), 2xHE-LTF80 MHZ_part4 is equal to 2xHE-LTF80 MHZ (12:258), and the 2xHE-LTF80 MHz_part5 is equal to 2xHE-LTF80 MHz (259:500); and 
 4xHE-LTF80 MHz_part2_Reverse indicates that 4xHE-LTF80 MHz_part2 is arranged in a reverse order, and 4xHE-LTF80 MHZ_part4_Reverse indicates that 4xHE-LTF80 MHz_part4 is arranged in a reverse order, 4xHE-LTF80 MHz_part1 is equal to 4xHE-LTF80 MHz (−500:−259), 4xHE-LTF80 MHz_part2 is equal to 4xHE-LTF80 MHZ (−258:−12), 4xHE-LTF80 MHZ_part3 is equal to 4xHE-LTF80 MHZ (−11:11), 4xHE-LTF80 MHz_part4 is equal to 4xHE-LTF80 MHZ (12:258), and the 4xHE-LTF80 MHz_part5 is equal to 4xHE-LTF80 MHz (259:500); or 
 
 wherein a 2xEHT-LTF sequence and a 4xEHT-LTF sequence in a 160 MHz bandwidth are calculated respectively according to the following equations:
 2xEHT-LTF160 MHZ=[2xEHT-LTF80 MHz_part1, 2xEHT-LTF80 MHZ_part2, (−1)*2xEHT-LTF80 MHz_part3, (−1)*2xEHT-LTF80 MHz_part4, 0 23 , 2xEHT-LTF80 MHz_part1, 2xEHT-LTF80 MHz_part2, 2xEHT-LTF80 MHz_part3, 2xEHT-LTF80 MHz_part4]; and 
 4xEHT-LTF160 MHZ=[4xEHT-LTF80 MHz_part1, 4xEHT-LTF80 MHZ_part2, (−1)*4xEHT-LTF80 MHZ_part3, 4xEHT-LTF80 MHZ_part4, 0 23 , 4xEHT-LTF80 MHz_part1, (−1)*4xEHT-LTF80 MHz_part2, 4xEHT-LTF80 MHz_part3, 4xEHT-LTF80 MHz_part4], wherein 
 2xEHT-LTF80 MHz_part1 is equal to 2xEHT-LTF80 MHz (−500:−257), 2xEHT-LTF80 MHz_part2 is equal to 2xEHT-LTF80 MHZ (−256:−1), 2xEHT-LTF80 MHZ_part3 is equal to 2xEHT-LTF80 MHZ (0:255), and the 2xEHT-LTF80 MHZ_part4 is equal to 2xEHT-LTF80 MHZ (256:500); and 
 4xEHT-LTF80 MHz_part1 is equal to 4xEHT-LTF80 MHz (−500:−257), 4xEHT-LTF80 MHz_part2 is equal to 4xEHT-LTF80 MHZ (−256:−1), 4xEHT-LTF80 MHZ_part3 is equal to 4xEHT-LTF80 MHZ (0:255), and the 4xEHT-LTF80 MHZ_part4 is equal to 4xEHT-LTF80 MHZ (256:500). 
 
 
     
     
       2. The method according to  claim 1 , wherein the 2xEHT-LTF sequence in the 80 MHz bandwidth is calculated according to the equation:
 2xEHT-LTF80 MHz=[2xHE-LTF80 MHz_part1, 2xNew_partA, 2xHE-LTF80 MHz_part2_Reverse, 2xNew_partB, 2xHE-LTF80 MHz_part4_Reverse, 2xNew_partC, 2xHE-LTF80 MHz_part5], wherein 
 2xNew_partA is equal to [1, 0, −1, 0, 1], 2xNew_partB is equal to [0, 1, 0, −1, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, −1, 0, 1, 0, −1, 0, 1, 0], and 2xNew_partC is equal to [−1, 0, 1, 0, 1]; and 
 2xHE-LTF80 MHz_part2_Reverse indicates that 2xHE-LTF80 MHz_part2 is arranged in a reverse order, and 2xHE-LTF80 MHz_part4_Reverse indicates that 2xHE-LTF80 MHz_part4 is arranged in a reverse order, 2xHE-LTF80 MHz_part1 is equal to 2xHE-LTF80 MHz (−500:−259), 2xHE-LTF80 MHz_part2 is equal to 2xHE-LTF80 MHz (−258:−17), 2xHE-LTF80 MHz_part4 is equal to 2xHE-LTF80 MHz (17:258), and 2xHE-LTF80 MHz_part5 is equal to 2xHE-LTF80 MHz (259:500). 
 
     
     
       3. The method according to  claim 1 , wherein the 4xEHT-LTF sequence in the 80 MHz bandwidth is calculated according to the equation:
 4xEHT-LTF80 MHz=[4xHE-LTF80 MHz_part1, 4xNew_partA, 4xHE-LTF80 MHz_part2_Reverse, 4xNew_partB, 4xHE-LTF80 MHz_part4_Reverse, 4xNew_partC, (−1)*4xHE-LTF80 MHz_part5], wherein 
 4xNew_partA is equal to [−1, −1, −1, −1, 1], 4xNew_partB is equal to [1, −1, −1, −1, 1, 1, −1, 1, −1, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, −1, 1, 1], and 4xNew_partC is equal to [−1, 1, −1, 1, −1]; and 
 4xHE-LTF80 MHz_part2_Reverse indicates that 4xHE-LTF80 MHz_part2 is arranged in a reverse order, and 4xHE-LTF80 MHz_part4_Reverse indicates that 4xHE-LTF80 MHz_part4 is arranged in a reverse order, 4xHE-LTF80 MHz_part1 is equal to 4xHE-LTF80 MHz (−500:−259), 4xHE-LTF80 MHz_part2 is equal to 4xHE-LTF80 MHz (−258:−17), 4xHE-LTF80 MHz_part4 is equal to 4xHE-LTF80 MHz (17:258), and 4xHE-LTF80 MHz_part5 is equal to 4xHE-LTF80 MHz (259:500). 
 
     
     
       4. The method according to  claim 1 , wherein the 2xEHT-LTF sequence and the 4xEHT-LTF sequence in an 80 MHz bandwidth are calculated respectively according to the equations:
 2xEHT-LTF80 MHz=[2xHE-LTF80 MHz_part1, 2xHE-LTF80 MHz_part2_Reverse, 2xHE-LTF80 MHz_part3, 2xHE-LTF80 MHz_part4_Reverse, 2xHE-LTF80 MHz_part5]; and 
 4xEHT-LTF80 MHz=[4xHE-LTF80 MHz_part1, 4xHE-LTF80 MHz_part2_Reverse, 4xHE-LTF80 MHz_part3, 4xHE-LTF80 MHz_part4_Reverse, 4xHE-LTF80 MHz_part5], wherein 
 2xHE-LTF80 MHz_part2_Reverse indicates that 2xHE-LTF80 MHz_part2 is arranged in a reverse order, and 2xHE-LTF80 MHz_part4_Reverse indicates that 2xHE-LTF80 MHz_part4 is arranged in a reverse order, 2xHE-LTF80 MHz_part1 is equal to 2xHE-LTF80 MHz (−500:−259), 2xHE-LTF80 MHz_part2 is equal to 2xHE-LTF80 MHz (−258:−12), 2xHE-LTF80 MHz_part3 is equal to 2xHE-LTF80 MHz (−11:11), 2xHE-LTF80 MHz_part4 is equal to 2xHE-LTF80 MHz (12:258), and the 2xHE-LTF80 MHz_part5 is equal to 2xHE-LTF80 MHz (259:500); and 
 4xHE-LTF80 MHz_part2_Reverse indicates that 4xHE-LTF80 MHz_part2 is arranged in a reverse order, and 4xHE-LTF80 MHz_part4_Reverse indicates that 4xHE-LTF80 MHz_part4 is arranged in a reverse order, 4xHE-LTF80 MHz_part1 is equal to 4xHE-LTF80 MHz (−500:−259), 4xHE-LTF80 MHz_part2 is equal to 4xHE-LTF80 MHz (−258:−12), 4xHE-LTF80 MHz_part3 is equal to 4xHE-LTF80 MHz (−11:11), 4xHE-LTF80 MHz_part4 is equal to 4xHE-LTF80 MHz (12:258), and the 4xHE-LTF80 MHz_part5 is equal to 4xHE-LTF80 MHz (259:500). 
 
     
     
       5. The method according to  claim 1 , wherein the 2xEHT-LTF sequence and the 4xEHT-LTF sequence in a 160 MHz bandwidth are calculated respectively according to the equations:
 2xEHT-LTF160 MHz=[2xEHT-LTF80 MHz_part1, 2xEHT-LTF80 MHz_part2, (−1)*2xEHT-LTF80 MHz_part3, (−1)*2xEHT-LTF80 MHz_part4, 0 23 , 2xEHT-LTF80 MHz_part1, 2xEHT-LTF80 MHz_part2, 2xEHT-LTF80 MHz_part3, 2xEHT-LTF80 MHz_part4]; and 
 4xEHT-LTF160 MHz=[4xEHT-LTF80 MHz_part1, 4xEHT-LTF80 MHz_part2, (−1)*4xEHT-LTF80 MHz_part3, 4xEHT-LTF80 MHz_part4, 0 23 , 4xEHT-LTF80 MHz_part1, (−1)*4xEHT-LTF80 MHz_part2, 4xEHT-LTF80 MHz_part3, 4xEHT-LTF80 MHz_part4], wherein 
 2xEHT-LTF80 MHz_part1 is equal to 2xEHT-LTF80 MHz (−500:−257), 2xEHT-LTF80 MHz_part2 is equal to 2xEHT-LTF80 MHz (−256:−1), 2xEHT-LTF80 MHz_part3 is equal to 2xEHT-LTF80 MHz (0:255), and the 2xEHT-LTF80 MHz_part4 is equal to 2xEHT-LTF80 MHz (256:500); and 
 4xEHT-LTF80 MHz_part1 is equal to 4xEHT-LTF80 MHz (−500:−257), 4xEHT-LTF80 MHz_part2 is equal to 4xEHT-LTF80 MHz (−256:−1), 4xEHT-LTF80 MHz_part3 is equal to 4xEHT-LTF80 MHz (0:255), and the 4xEHT-LTF80 MHz_part4 is equal to 4xEHT-LTF80 MHz (256:500). 
 
     
     
       6. A method for transmitting an extremely high throughput long training field (EHT-LTF) sequence, comprising:
 receiving, by a second communication device, an extremely high throughput physical layer protocol data unit (EHT PPDU), wherein the EHT PPDU comprises an EHT-LTF; and 
 parsing, by the second communication device, the EHT-LTF in the EHT PPDU, 
 wherein a 2xEHT-LTF sequence in an 80 MHz bandwidth is calculated according to the following equation:
 2xEHT-LTF80 MHZ=[2xHE-LTF80 MHz_part1, 2xNew_partA, 2xHE-LTF80 MHZ_part2_Reverse, 2xNew_partB, 2xHE-LTF80 MHz_part4_Reverse, 2xNew_partC, 2xHE-LTF80 MHZ_part5], wherein 
 2xNew_partA is equal to [1, 0, −1, 0, 1], 2xNew_partB is equal to [0, 1, 0, −1, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, −1, 0, 1, 0, −1, 0, 1, 0], and 2xNew_partC is equal to [−1, 0, 1, 0, 1]; and 
 2xHE-LTF80 MHz_part2_Reverse indicates that 2xHE-LTF80 MHZ_part2 is arranged in a reverse order, and 2xHE-LTF80 MHz_part4_Reverse indicates that 2xHE-LTF80 MHz_part4 is arranged in a reverse order, 2xHE-LTF80 MHz_part1 is equal to 2xHE-LTF80 MHZ (−500:−259), 2xHE-LTF80 MHz_part2 is equal to 2xHE-LTF80 MHz (−258:−17), 2xHE-LTF80 MHZ_part4 is equal to 2xHE-LTF80 MHZ (17:258), and 2xHE-LTF80 MHz_part5 is equal to 2xHE-LTF80 MHZ (259:500); 
 
 wherein a 4xEHT-LTF sequence in an 80 MHz bandwidth is calculated according to the following equation:
 4xEHT-LTF80 MHZ=[4xHE-LTF80 MHZ_part1, 4xNew_partA, 4xHE-LTF80 MHz_part2_Reverse, 4xNew_partB, 4xHE-LTF80 MHz_part4_Reverse, 4xNew_partC, (−1)*4xHE-LTF80 MHZ_part5], wherein 
 4xNew_partA is equal to [−1, −1, −1, −1, 1], 4xNew_partB is equal to [1, −1, −1, −1, 1, 1, −1, 1, −1, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, −1, 1, 1], and 4xNew_partC is equal to [−1, 1, −1, 1, −1]; and 
 4xHE-LTF80 MHz_part2_Reverse indicates that 4xHE-LTF80 MHz_part2 is arranged in a reverse order, and 4xHE-LTF80 MHz_part4_Reverse indicates that 4xHE-LTF80 MHz_part4 is arranged in a reverse order, 4xHE-LTF80 MHz_part1 is equal to 4xHE-LTF80 MHZ (−500:−259), 4xHE-LTF80 MHz_part2 is equal to 4xHE-LTF80 MHz (−258:−17), 4xHE-LTF80 MHz_part4 is equal to 4xHE-LTF80 MHz (17:258), and 4xHE-LTF80 MHz_part5 is equal to 4xHE-LTF80 MHz (259:500); 
 
 wherein a 2xEHT-LTF sequence and a 4xEHT-LTF sequence in an 80 MHz bandwidth are calculated respectively according to the following equations:
 2xEHT-LTF80 MHZ=[2xHE-LTF80 MHZ_part1, 2xHE-LTF80 MHz_part2_Reverse, 2xHE-LTF80 MHZ_part3, 2xHE-LTF80 MHz_part4_Reverse, 2xHE-LTF80 MHz_part5]; and 
 4xEHT-LTF80 MHZ [4xHE-LTF80 MHz_part1, 4xHE-LTF80 MHz_part2_Reverse, 4xHE-LTF80 MHz_part3, 4xHE-LTF80 MHz_part4_Reverse, 4xHE-LTF80 MHZ_part5], wherein 
 2xHE-LTF80 MHz_part2_Reverse indicates that 2xHE-LTF80 MHz_part2 is arranged in a reverse order, and 2xHE-LTF80 MHZ_part4_Reverse indicates that 2xHE-LTF80 MHz_part4 is arranged in a reverse order, 2xHE-LTF80 MHZ_part1 is equal to 2xHE-LTF80 MHZ (−500:−259), 2xHE-LTF80 MHz_part2 is equal to 2xHE-LTF80 MHZ (−258:−12), 2xHE-LTF80 MHz_part3 is equal to 2xHE-LTF80 MHZ (−11:11), 2xHE-LTF80 MHz_part4 is equal to 2xHE-LTF80 MHZ (12:258), and the 2xHE-LTF80 MHz_part5 is equal to 2xHE-LTF80 MHZ (259:500); and 
 4xHE-LTF80 MHz_part2_Reverse indicates that 4xHE-LTF80 MHz_part2 is arranged in a reverse order, and 4xHE-LTF80 MHZ_part4_Reverse indicates that 4xHE-LTF80 MHz_part4 is arranged in a reverse order, 4xHE-LTF80 MHz_part1 is equal to 4xHE-LTF80 MHz (−500:−259), 4xHE-LTF80 MHz_part2 is equal to 4xHE-LTF80 MHz (−258:−12), 4xHE-LTF80 MHz_part3 is equal to 4xHE-LTF80 MHz (−11:11), 4xHE-LTF80 MHz_part4 is equal to 4xHE-LTF80 MHZ (12:258), and the 4xHE-LTF80 MHz_part5 is equal to 4xHE-LTF80 MHZ (259:500); or 
 
 wherein a 2xEHT-LTF sequence and a 4xEHT-LTF sequence in a 160 MHz bandwidth are calculated respectively according to the following equations:
 2xEHT-LTF160 MHz=[2xEHT-LTF80 MHz_part1, 2xEHT-LTF80 MHz_part2, (−1)*2xEHT-LTF80 MHz_part3, (−1)*2xEHT-LTF80 MHz_part4, 0 23 , 2xEHT-LTF80 MHz_part1, 2xEHT-LTF80 MHz_part2, 2xEHT-LTF80 MHz_part3, 2xEHT-LTF80 MHz_part4]; and 
 4xEHT-LTF160 MHz=[4xEHT-LTF80 MHz_part1, 4xEHT-LTF80 MHz_part2, (−1)*4xEHT-LTF80 MHz_part3, 4xEHT-LTF80 MHz_part4, 0 23 , 4xEHT-LTF80 MHz_part1, (−1)*4xEHT-LTF80 MHZ_part2, 4xEHT-LTF80 MHz_part3, 4xEHT-LTF80 MHz_part4], wherein 
 2xEHT-LTF80 MHz_part1 is equal to 2xEHT-LTF80 MHZ (−500:−257), 2xEHT-LTF80 MHz_part2 is equal to 2xEHT-LTF80 MHz (−256:−1), 2xEHT-LTF80 MHZ_part3 is equal to 2xEHT-LTF80 MHz (0:255), and the 2xEHT-LTF80 MHz_part4 is equal to 2xEHT-LTF80 MHZ (256:500); and 
 4xEHT-LTF80 MHz_part1 is equal to 4xEHT-LTF80 MHz (−500:−257), 4xEHT-LTF80 MHz_part2 is equal to 4xEHT-LTF80 MHz (−256:−1), 4xEHT-LTF80 MHZ_part3 is equal to 4xEHT-LTF80 MHz (0:255), and the 4xEHT-LTF80 MHz_part4 is equal to 4xEHT-LTF80 MHZ (256:500). 
 
 
     
     
       7. The method according to  claim 6 , wherein the 2xEHT-LTF sequence in the 80 MHz bandwidth is calculated according to the equation:
 2xEHT-LTF80 MHz [2xHE-LTF80 MHz_part1, 2xNew_partA, 2xHE-LTF80 MHz_part2_Reverse, 2xNew_partB, 2xHE-LTF80 MHz_part4_Reverse, 2xNew_partC, 2xHE-LTF80 MHz_part5], wherein 
 2xNew_partA is equal to [1, 0, −1, 0, 1], 2xNew_partB is equal to [0, 1, 0, −1, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, −1, 0, 1, 0, −1, 0, 1, 0], and 2xNew_partC is equal to [−1, 0, 1, 0, 1]; and 
 2xHE-LTF80 MHz_part2_Reverse indicates that 2xHE-LTF80 MHz_part2 is arranged in a reverse order, and 2xHE-LTF80 MHz_part4_Reverse indicates that 2xHE-LTF80 MHz_part4 is arranged in a reverse order, 2xHE-LTF80 MHz_part1 is equal to 2xHE-LTF80 MHz (−500:−259), 2xHE-LTF80 MHz_part2 is equal to 2xHE-LTF80 MHz (−258:−17), 2xHE-LTF80 MHz_part4 is equal to 2xHE-LTF80 MHz (17:258), and 2xHE-LTF80 MHz_part5 is equal to 2xHE-LTF80 MHz (259:500). 
 
     
     
       8. The method according to  claim 6 , wherein the 4xEHT-LTF sequence in the 80 MHz bandwidth is calculated according to the equation:
 4xEHT-LTF80 MHz [4xHE-LTF80 MHz_part1, 4xNew_partA, 4xHE-LTF80 MHz_part2_Reverse, 4xNew_partB, 4xHE-LTF80 MHz_part4_Reverse, 4xNew_partC, (−1)*4xHE-LTF80 MHz_part5], wherein 
 4xNew_partA is equal to [−1, −1, −1, −1, 1], 4xNew_partB is equal to [1, −1, −1, −1, 1, 1, −1, 1, −1, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, −1, 1, 1], and 4xNew_partC is equal to [−1, 1, −1, 1, −1]; and 
 4xHE-LTF80 MHz_part2_Reverse indicates that 4xHE-LTF80 MHz_part2 is arranged in a reverse order, and 4xHE-LTF80 MHz_part4_Reverse indicates that 4xHE-LTF80 MHz_part4 is arranged in a reverse order, 4xHE-LTF80 MHz_part1 is equal to 4xHE-LTF80 MHz (−500:−259), 4xHE-LTF80 MHz_part2 is equal to 4xHE-LTF80 MHz (−258:−17), 4xHE-LTF80 MHz_part4 is equal to 4xHE-LTF80 MHz (17:258), and 4xHE-LTF80 MHz_part5 is equal to 4xHE-LTF80 MHz (259:500). 
 
     
     
       9. The method according to  claim 6 , wherein the 2xEHT-LTF sequence and the 4xEHT-LTF sequence in an 80 MHz bandwidth are calculated respectively according to the equations:
 2xEHT-LTF80 MHz=[2xHE-LTF80 MHz_part1, 2xHE-LTF80 MHz_part2_Reverse, 2xHE-LTF80 MHz_part3, 2xHE-LTF80 MHz_part4_Reverse, 2xHE-LTF80 MHz_part5]; and 
 4xEHT-LTF80 MHZ=[4xHE-LTF80 MHz_part1, 4xHE-LTF80 MHz_part2_Reverse, 4xHE-LTF80 MHz_part3, 4xHE-LTF80 MHz_part4_Reverse, 4xHE-LTF80 MHz_part5], wherein 
 2xHE-LTF80 MHz_part2_Reverse indicates that 2xHE-LTF80 MHz_part2 is arranged in a reverse order, and 2xHE-LTF80 MHz_part4_Reverse indicates that 2xHE-LTF80 MHz_part4 is arranged in a reverse order, 2xHE-LTF80 MHz_part1 is equal to 2xHE-LTF80 MHz (−500:−259), 2xHE-LTF80 MHz_part2 is equal to 2xHE-LTF80 MHz (−258:−12), 2xHE-LTF80 MHz_part3 is equal to 2xHE-LTF80 MHz (−11:11), 2xHE-LTF80 MHz_part4 is equal to 2xHE-LTF80 MHz (12:258), and the 2xHE-LTF80 MHz_part5 is equal to 2xHE-LTF80 MHz (259:500); and 
 4xHE-LTF80 MHz_part2_Reverse indicates that 4xHE-LTF80 MHz_part2 is arranged in a reverse order, and 4xHE-LTF80 MHz_part4_Reverse indicates that 4xHE-LTF80 MHz_part4 is arranged in a reverse order, 4xHE-LTF80 MHz_part1 is equal to 4xHE-LTF80 MHz (−500:−259), 4xHE-LTF80 MHz_part2 is equal to 4xHE-LTF80 MHz (−258:−12), 4xHE-LTF80 MHz_part3 is equal to 4xHE-LTF80 MHz (−11:11), 4xHE-LTF80 MHz_part4 is equal to 4xHE-LTF80 MHz (12:258), and the 4xHE-LTF80 MHz_part5 is equal to 4xHE-LTF80 MHz (259:500). 
 
     
     
       10. The method according to  claim 6 , wherein the 2xEHT-LTF sequence and the 4xEHT-LTF sequence in a 160 MHz bandwidth are calculated respectively according to the equations:
 2xEHT-LTF160 MHz=[2xEHT-LTF80 MHz_part1, 2xEHT-LTF80 MHz_part2, (−1)*2xEHT-LTF80 MHz_part3, (−1)*2xEHT-LTF80 MHz_part4, 0 23 , 2xEHT-LTF80 MHz_part1, 2xEHT-LTF80 MHz_part2, 2xEHT-LTF80 MHz_part3, 2xEHT-LTF80 MHz_part4]; and 
 4xEHT-LTF160 MHz=[4xEHT-LTF80 MHz_part1, 4xEHT-LTF80 MHz_part2, (−1)*4xEHT-LTF80 MHz_part3, 4xEHT-LTF80 MHz_part4, 0 23 , 4xEHT-LTF80 MHz_part1, (−1)*4xEHT-LTF80 MHz_part2, 4xEHT-LTF80 MHz_part3, 4xEHT-LTF80 MHz_part4], wherein 
 2xEHT-LTF80 MHz_part1 is equal to 2xEHT-LTF80 MHz (−500:−257), 2xEHT-LTF80 MHz_part2 is equal to 2xEHT-LTF80 MHz (−256:−1), 2xEHT-LTF80 MHz_part3 is equal to 2xEHT-LTF80 MHz (0:255), and the 2xEHT-LTF80 MHz_part4 is equal to 2xEHT-LTF80 MHz (256:500); and 
 4xEHT-LTF80 MHz_part1 is equal to 4xEHT-LTF80 MHz (−500:−257), 4xEHT-LTF80 MHz_part2 is equal to 4xEHT-LTF80 MHz (−256:−1), 4xEHT-LTF80 MHz_part3 is equal to 4xEHT-LTF80 MHz (0:255), and the 4xEHT-LTF80 MHz_part4 is equal to 4xEHT-LTF80 MHz (256:500). 
 
     
     
       11. An apparatus, applied for a first communication device, comprising:
 at least one processor, and a memory storing instructions that, when executed by the at least one processor, cause the first communication device to perform operations comprising: 
 generating an extremely high throughput physical layer protocol data unit (EHT PPDU), wherein the EHT PPDU comprises an EHT-LTF; and 
 sending the EHT PPDU, 
 wherein a 2xEHT-LTF sequence in an 80 MHz bandwidth is calculated according to the following equation:
 2xEHT-LTF80 MHZ=[2xHE-LTF80 MHZ_part1, 2xNew_partA, 2xHE-LTF80 MHz_part2_Reverse, 2xNew_partB, 2xHE-LTF80 MHz_part4_Reverse, 2xNew_partC, 2xHE-LTF80 MHZ_part5], wherein 
 2xNew_partA is equal to [1, 0, −1, 0, 1], 2xNew_partB is equal to [0, 1, 0, −1, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, −1, 0, 1, 0, −1, 0, 1, 0], and 2xNew_partC is equal to [−1, 0, 1, 0, 1]; and 
 2xHE-LTF80 MHz_part2_Reverse indicates that 2xHE-LTF80 MHz_part2 is arranged in a reverse order, and 2xHE-LTF80 MHz_part4_Reverse indicates that 2xHE-LTF80 MHz_part4 is arranged in a reverse order, 2xHE-LTF80 MHz_part1 is equal to 2xHE-LTF80 MHz (−500:−259), 2xHE-LTF80 MHz_part2 is equal to 2xHE-LTF80 MHZ (−258:−17), 2xHE-LTF80 MHZ_part4 is equal to 2xHE-LTF80 MHZ (17:258), and 2xHE-LTF80 MHz_part5 is equal to 2xHE-LTF80 MHZ (259:500); 
 
 wherein a 4xEHT-LTF sequence in an 80 MHz bandwidth is calculated according to the following equation:
 4xEHT-LTF80 MHZ=[4xHE-LTF80 MHZ_part1, 4xNew_partA, 4xHE-LTF80 MHz_part2_Reverse, 4xNew_partB, 4xHE-LTF80 MHZ_part4_Reverse, 4xNew_partC, (−1)*4xHE-LTF80 MHZ_part5], wherein 
 4xNew_partA is equal to [−1, −1, −1, −1, 1], 4xNew_partB is equal to [1, −1, −1, −1, 1, 1, −1, 1, −1, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, −1, 1, 1], and 4xNew_partC is equal to [−1, 1, −1, 1, −1]; and 
 4xHE-LTF80 MHZ_part2_Reverse indicates that 4xHE-LTF80 MHz_part2 is arranged in a reverse order, and 4xHE-LTF80 MHZ_part4_Reverse indicates that 4xHE-LTF80 MHz_part4 is arranged in a reverse order, 4xHE-LTF80 MHz_part1 is equal to 4xHE-LTF80 MHZ (−500:−259), 4xHE-LTF80 MHz_part2 is equal to 4xHE-LTF80 MHz (−258:−17), 4xHE-LTF80 MHz_part4 is equal to 4xHE-LTF80 MHz (17:258), and 4xHE-LTF80 MHz_part5 is equal to 4xHE-LTF80 MHZ (259:500); 
 
 wherein a 2xEHT-LTF sequence and a 4xEHT-LTF sequence in an 80 MHz bandwidth are calculated respectively according to the following equations:
 2xEHT-LTF80 MHZ=[2xHE-LTF80 MHz_part1, 2xHE-LTF80 MHz_part2_Reverse, 2xHE-LTF80 MHz_part3, 2xHE-LTF80 MHz_part4_Reverse, 2xHE-LTF80 MHZ_part5]; and 
 4xEHT-LTF80 MHZ=[4xHE-LTF80 MHZ_part1, 4xHE-LTF80 MHz_part2_Reverse, 4xHE-LTF80 MHZ_part3, 4xHE-LTF80 MHz_part4_Reverse, 4xHE-LTF80 MHz_part5], wherein 
 2xHE-LTF80 MHz_part2_Reverse indicates that 2xHE-LTF80 MHz_part2 is arranged in a reverse order, and 2xHE-LTF80 MHZ_part4_Reverse indicates that 2xHE-LTF80 MHz_part4 is arranged in a reverse order, 2xHE-LTF80 MHz_part1 is equal to 2xHE-LTF80 MHz (−500:−259), 2xHE-LTF80 MHz_part2 is equal to 2xHE-LTF80 MHz (−258:−12), 2xHE-LTF80 MHz_part3 is equal to 2xHE-LTF80 MHz (−11:11), 2xHE-LTF80 MHz_part4 is equal to 2xHE-LTF80 MHz (12:258), and the 2xHE-LTF80 MHz_part5 is equal to 2xHE-LTF80 MHz (259:500); and 
 4xHE-LTF80 MHz_part2_Reverse indicates that 4xHE-LTF80 MHz_part2 is arranged in a reverse order, and 4xHE-LTF80 MHz_part4_Reverse indicates that 4xHE-LTF80 MHz_part4 is arranged in a reverse order, 4xHE-LTF80 MHz_part1 is equal to 4xHE-LTF80 MHZ (−500:−259), 4xHE-LTF80 MHz_part2 is equal to 4xHE-LTF80 MHz (−258:−12), 4xHE-LTF80 MHZ_part3 is equal to 4xHE-LTF80 MHZ (−11:11), 4xHE-LTF80 MHz_part4 is equal to 4xHE-LTF80 MHZ (12:258), and the 4xHE-LTF80 MHz_part5 is equal to 4xHE-LTF80 MHZ (259:500); or 
 
 wherein a 2xEHT-LTF sequence and a 4xEHT-LTF sequence in a 160 MHz bandwidth are calculated respectively according to the following equations:
 2xEHT-LTF160 MHZ=[2xEHT-LTF80 MHz_part1, 2xEHT-LTF80 MHz_part2, (−1)*2xEHT-LTF80 MHZ_part3, (−1)*2xEHT-LTF80 MHZ_part4, 0 23 , 2xEHT-LTF80 MHz_part1, 2xEHT-LTF80 MHz_part2, 2xEHT-LTF80 MHz_part3, 2xEHT-LTF80 MHz_part4]; and 
 4xEHT-LTF160 MHz=[4xEHT-LTF80 MHZ_part1, 4xEHT-LTF80 MHz_part2, (−1)*4xEHT-LTF80 MHz_part3, 4xEHT-LTF80 MHz_part4, 0 23 , 4xEHT-LTF80 MHz_part1, (−1)*4xEHT-LTF80 MHz_part2, 4xEHT-LTF80 MHz_part3, 4xEHT-LTF80 MHz_part4], wherein 
 2xEHT-LTF80 MHz_part1 is equal to 2xEHT-LTF80 MHZ (−500:−257), 2xEHT-LTF80 MHz_part2 is equal to 2xEHT-LTF80 MHz (−256:−1), 2xEHT-LTF80 MHz_part3 is equal to 2xEHT-LTF80 MHZ (0:255), and the 2xEHT-LTF80 MHz_part4 is equal to 2xEHT-LTF80 MHz (256:500); and 
 4xEHT-LTF80 MHz_part1 is equal to 4xEHT-LTF80 MHz (−500:−257), 4xEHT-LTF80 MHz_part2 is equal to 4xEHT-LTF80 MHZ (−256:−1), 4xEHT-LTF80 MHZ_part3 is equal to 4xEHT-LTF80 MHz (0:255), and the 4xEHT-LTF80 MHZ_part4 is equal to 4xEHT-LTF80 MHZ (256:500). 
 
 
     
     
       12. The apparatus according to  claim 11 , wherein the 2xEHT-LTF sequence in the 80 MHz bandwidth is calculated according to the following equation:
 2xEHT-LTF80 MHz [2xHE-LTF80 MHz_part1, 2xNew_partA, 2xHE-LTF80 MHz_part2_Reverse, 2xNew_partB, 2xHE-LTF80 MHz_part4_Reverse, 2xNew_partC, 2xHE-LTF80 MHz_part5], wherein 
 2xNew_partA is equal to [1, 0, −1, 0, 1], 2xNew_partB is equal to [0, 1, 0, −1, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, −1, 0, 1, 0, −1, 0, 1, 0], and 2xNew_partC is equal to [−1, 0, 1, 0, 1]; and 
 2xHE-LTF80 MHz_part2_Reverse indicates that 2xHE-LTF80 MHz_part2 is arranged in a reverse order, and 2xHE-LTF80 MHz_part4_Reverse indicates that 2xHE-LTF80 MHz_part4 is arranged in a reverse order, 2xHE-LTF80 MHz_part1 is equal to 2xHE-LTF80 MHz (−500:−259), 2xHE-LTF80 MHz_part2 is equal to 2xHE-LTF80 MHz (−258:−17), 2xHE-LTF80 MHz_part4 is equal to 2xHE-LTF80 MHZ (17:258), and 2xHE-LTF80 MHz_part5 is equal to 2xHE-LTF80 MHz (259:500). 
 
     
     
       13. The apparatus according to  claim 11 , wherein the 4xEHT-LTF sequence in the 80 MHz bandwidth is calculated according to the equation:
 4xEHT-LTF80 MHz=[4xHE-LTF80 MHz_part1, 4xNew_partA, 4xHE-LTF80 MHz_part2_Reverse, 4xNew_partB, 4xHE-LTF80 MHz_part4_Reverse, 4xNew_partC, (−1)*4xHE-LTF80 MHz_part5], wherein 
 4xNew_partA is equal to [−1, −1, −1, −1, 1], 4xNew_partB is equal to [1, −1, −1, −1, 1, 1, −1, 1, −1, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, −1, 1, 1], and 4xNew_partC is equal to [−1, 1, −1, 1, −1]; and 
 4xHE-LTF80 MHz_part2_Reverse indicates that 4xHE-LTF80 MHz_part2 is arranged in a reverse order, and 4xHE-LTF80 MHz_part4_Reverse indicates that 4xHE-LTF80 MHz_part4 is arranged in a reverse order, 4xHE-LTF80 MHz_part1 is equal to 4xHE-LTF80 MHz (−500:−259), 4xHE-LTF80 MHz_part2 is equal to 4xHE-LTF80 MHz (−258:−17), 4xHE-LTF80 MHz_part4 is equal to 4xHE-LTF80 MHz (17:258), and 4xHE-LTF80 MHz_part5 is equal to 4xHE-LTF80 MHz (259:500). 
 
     
     
       14. The apparatus according to  claim 11 , wherein the 2xEHT-LTF sequence and the 4xEHT-LTF sequence in an 80 MHz bandwidth are calculated respectively according to the equations:
 2xEHT-LTF80 MHz=[2xHE-LTF80 MHz_part1, 2xHE-LTF80 MHz_part2_Reverse, 2xHE-LTF80 MHz_part3, 2xHE-LTF80 MHz_part4_Reverse, 2xHE-LTF80 MHz_part5]; and 
 4xEHT-LTF80 MHz=[4xHE-LTF80 MHz_part1, 4xHE-LTF80 MHz_part2_Reverse, 4xHE-LTF80 MHz_part3, 4xHE-LTF80 MHz_part4_Reverse, 4xHE-LTF80 MHz_part5], wherein 
 2xHE-LTF80 MHz_part2_Reverse indicates that 2xHE-LTF80 MHz_part2 is arranged in a reverse order, and 2xHE-LTF80 MHz_part4_Reverse indicates that 2xHE-LTF80 MHz_part4 is arranged in a reverse order, 2xHE-LTF80 MHz_part1 is equal to 2xHE-LTF80 MHz (−500:−259), 2xHE-LTF80 MHz_part2 is equal to 2xHE-LTF80 MHz (−258:−12), 2xHE-LTF80 MHz_part3 is equal to 2xHE-LTF80 MHz (−11:11), 2xHE-LTF80 MHz_part4 is equal to 2xHE-LTF80 MHz (12:258), and the 2xHE-LTF80 MHz_part5 is equal to 2xHE-LTF80 MHz (259:500); and 
 4xHE-LTF80 MHz_part2_Reverse indicates that 4xHE-LTF80 MHz_part2 is arranged in a reverse order, and 4xHE-LTF80 MHz_part4_Reverse indicates that 4xHE-LTF80 MHz_part4 is arranged in a reverse order, 4xHE-LTF80 MHz_part1 is equal to 4xHE-LTF80 MHz (−500:−259), 4xHE-LTF80 MHz_part2 is equal to 4xHE-LTF80 MHz (−258:−12), 4xHE-LTF80 MHz_part3 is equal to 4xHE-LTF80 MHz (−11:11), 4xHE-LTF80 MHz_part4 is equal to 4xHE-LTF80 MHz (12:258), and the 4xHE-LTF80 MHz_part5 is equal to 4xHE-LTF80 MHz (259:500). 
 
     
     
       15. The apparatus according to  claim 11 , wherein the 2xEHT-LTF sequence and the 4xEHT-LTF sequence in a 160 MHz bandwidth are calculated respectively according to the equations:
 2xEHT-LTF160 MHz=[2xEHT-LTF80 MHz_part1, 2xEHT-LTF80 MHz_part2, (−1)*2xEHT-LTF80 MHz_part3, (−1)*2xEHT-LTF80 MHz_part4, 0 23 , 2xEHT-LTF80 MHz_part1, 2xEHT-LTF80 MHz_part2, 2xEHT-LTF80 MHz_part3, 2xEHT-LTF80 MHz_part4]; and 
 4xEHT-LTF160 MHz=[4xEHT-LTF80 MHz_part1, 4xEHT-LTF80 MHz_part2, (−1)*4xEHT-LTF80 MHz_part3, 4xEHT-LTF80 MHz_part4, 0 23 , 4xEHT-LTF80 MHz_part1, (−1)*4xEHT-LTF80 MHz_part2, 4xEHT-LTF80 MHz_part3, 4xEHT-LTF80 MHz_part4], wherein 
 2xEHT-LTF80 MHz_part1 is equal to 2xEHT-LTF80 MHz (−500:−257), 2xEHT-LTF80 MHz_part2 is equal to 2xEHT-LTF80 MHz (−256:−1), 2xEHT-LTF80 MHz_part3 is equal to 2xEHT-LTF80 MHz (0:255), and the 2xEHT-LTF80 MHz_part4 is equal to 2xEHT-LTF80 MHz (256:500); and 
 4xEHT-LTF80 MHz_part1 is equal to 4xEHT-LTF80 MHz (−500:−257), 4xEHT-LTF80 MHz_part2 is equal to 4xEHT-LTF80 MHz (−256:−1), 4xEHT-LTF80 MHz_part3 is equal to 4xEHT-LTF80 MHz (0:255), and the 4xEHT-LTF80 MHz_part4 is equal to 4xEHT-LTF80 MHz (256:500). 
 
     
     
       16. An apparatus, applied for a second communication device, comprising:
 at least one processor, and a memory storing instructions that, when executed by the at least one processor, cause the apparatus to perform operations comprising: 
 receiving an extremely high throughput physical layer protocol data unit (EHT PPDU), wherein the EHT PPDU comprises an EHT-LTF; and 
 parsing the EHT-LTF in the EHT PPDU, 
 wherein a 2x EHT-LTF sequence in an 80 MHz bandwidth is calculated according to the following equations:
 2xEHT-LTF80 MHZ=[2xHE-LTF80 MHZ_part1, 2xNew_partA, 2xHE-LTF80 MHz_part2_Reverse, 2xNew_partB, 2xHE-LTF80 MHz_part4_Reverse, 2xNew_partC, 2xHE-LTF80 MHZ_part5], wherein 
 2xNew_partA is equal to [1, 0, −1, 0, 1], 2xNew_partB is equal to [0, 1, 0, −1, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, −1, 0, 1, 0, −1, 0, 1, 0], and 2xNew_partC is equal to [−1, 0, 1, 0, 1]; and 
 2xHE-LTF80 MHz_part2_Reverse indicates that 2xHE-LTF80 MHz_part2 is arranged in a reverse order, and 2xHE-LTF80 MHz_part4_Reverse indicates that 2xHE-LTF80 MHz_part4 is arranged in a reverse order, 2xHE-LTF80 MHz_part1 is equal to 2xHE-LTF80 MHZ (−500:−259), 2xHE-LTF80 MHz_part2 is equal to 2xHE-LTF80 MHZ (−258:−17), 2xHE-LTF80 MHz_part4 is equal to 2xHE-LTF80 MHZ (17:258), and 2xHE-LTF80 MHZ_part5 is equal to 2xHE-LTF80 MHZ (259:500); 
 
 wherein a 4xEHT-LTF sequence in an 80 MHz bandwidth is calculated according to the following equation:
 4xEHT-LTF80 MHZ=[4xHE-LTF80 MHz_part1, 4xNew_partA, 4xHE-LTF80 MHz_part2_Reverse, 4xNew_partB, 4xHE-LTF80 MHz_part4_Reverse, 4xNew_partC, (−1)*4xHE-LTF80 MHZ_part5], wherein 
 4xNew_partA is equal to [−1, −1, −1, −1, 1], 4xNew_partB is equal to [1, −1, −1, −1, 1, 1, −1, 1, −1, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, −1, 1, 1], and 4xNew_partC is equal to [−1, 1, −1, 1, −1]; and 
 4xHE-LTF80 MHz_part2_Reverse indicates that 4xHE-LTF80 MHZ_part2 is arranged in a reverse order, and 4xHE-LTF80 MHZ_part4_Reverse indicates that 4xHE-LTF80 MHz_part4 is arranged in a reverse order, 4xHE-LTF80 MHz_part1 is equal to 4xHE-LTF80 MHZ (−500:−259), 4xHE-LTF80 MHz_part2 is equal to 4xHE-LTF80 MHz (−258:−17), 4xHE-LTF80 MHz_part4 is equal to 4xHE-LTF80 MHZ (17:258), and 4xHE-LTF80 MHz_part5 is equal to 4xHE-LTF80 MHZ (259:500); 
 
 wherein a 2xEHT-LTF sequence and a 4xEHT-LTF sequence in an 80 MHz bandwidth are calculated respectively according to the following equations:
 2xEHT-LTF80 MHZ=[2xHE-LTF80 MHZ_part1, 2xHE-LTF80 MHz_part2_Reverse, 2xHE-LTF80 MHZ_part3, 2xHE-LTF80 MHz_part4_Reverse, 2xHE-LTF80 MHZ_part5]; and 
 4xEHT-LTF80 MHZ [4xHE-LTF80 MHZ_part1, 4xHE-LTF80 MHz_part2_Reverse, 4xHE-LTF80 MHZ_part3, 4xHE-LTF80 MHz_part4_Reverse, 4xHE-LTF80 MHZ_part5], wherein 
 2xHE-LTF80 MHZ_part2_Reverse indicates that 2xHE-LTF80 MHz_part2 is arranged in a reverse order, and 2xHE-LTF80 MHz_part4_Reverse indicates that 2xHE-LTF80 MHz_part4 is arranged in a reverse order, 2xHE-LTF80 MHz_part1 is equal to 2xHE-LTF80 MHz (−500:−259), 2xHE-LTF80 MHZ_part2 is equal to 2xHE-LTF80 MHz (−258:−12), 2xHE-LTF80 MHz_part3 is equal to 2xHE-LTF80 MHZ (−11:11), 2xHE-LTF80 MHz_part4 is equal to 2xHE-LTF80 MHZ (12:258), and the 2xHE-LTF80 MHz_part5 is equal to 2xHE-LTF80 MHZ (259:500); and 
 4xHE-LTF80 MHZ_part2_Reverse indicates that 4xHE-LTF80 MHz_part2 is arranged in a reverse order, and 4xHE-LTF80 MHZ_part4_Reverse indicates that 4xHE-LTF80 MHz_part4 is arranged in a reverse order, 4xHE-LTF80 MHZ_part1 is equal to 4xHE-LTF80 MHz (−500:−259), 4xHE-LTF80 MHz_part2 is equal to 4xHE-LTF80 MHZ (−258:−12), 4xHE-LTF80 MHZ_part3 is equal to 4xHE-LTF80 MHZ (−11:11), 4xHE-LTF80 MHz_part4 is equal to 4xHE-LTF80 MHZ (12:258), and the 4xHE-LTF80 MHz_part5 is equal to 4xHE-LTF80 MHz (259:500); or 
 
 wherein a 2xEHT-LTF sequence and a 4xEHT-LTF sequence in a 160 MHz bandwidth are calculated respectively according to the following equations:
 2xEHT-LTF160 MHz=[2xEHT-LTF80 MHz_part1, 2xEHT-LTF80 MHZ_part2, (−1)*2xEHT-LTF80 MHZ_part3, (−1)*2xEHT-LTF80 MHZ_part4, 0 23 , 2xEHT-LTF80 MHz_part1, 2xEHT-LTF80 MHz_part2, 2xEHT-LTF80 MHZ_part3, 2xEHT-LTF80 MHz_part4]; and 
 4xEHT-LTF160 MHz=[4xEHT-LTF80 MHz_part1, 4xEHT-LTF80 MHZ_part2, (−1)*4xEHT-LTF80 MHZ_part3, 4xEHT-LTF80 MHz_part4, 0 23 , 4xEHT-LTF80 MHz_part1, (−1)*4xEHT-LTF80 MHz_part2, 4xEHT-LTF80 MHZ_part3, 4xEHT-LTF80 MHZ_part4], wherein 
 2xEHT-LTF80 MHZ_part1 is equal to 2xEHT-LTF80 MHZ (−500:−257), 2xEHT-LTF80 MHz_part2 is equal to 2xEHT-LTF80 MHz (−256:−1), 2xEHT-LTF80 MHZ_part3 is equal to 2xEHT-LTF80 MHz (0:255), and the 2xEHT-LTF80 MHz_part4 is equal to 2xEHT-LTF80 MHz (256:500); and 
 4xEHT-LTF80 MHz_part1 is equal to 4xEHT-LTF80 MHz (−500:−257), 4xEHT-LTF80 MHz_part2 is equal to 4xEHT-LTF80 MHz (−256:−1), 4xEHT-LTF80 MHZ_part3 is equal to 4xEHT-LTF80 MHz (0:255), and the 4xEHT-LTF80 MHZ_part4 is equal to 4xEHT-LTF80 MHZ (256:500). 
 
 
     
     
       17. The apparatus according to  claim 16 , wherein the 2xEHT-LTF sequence in the 80 MHz bandwidth is calculated according to the equations:
 2xEHT-LTF80 MHz [2xHE-LTF80 MHz_part1, 2xNew_partA, 2xHE-LTF80 MHz_part2_Reverse, 2xNew_partB, 2xHE-LTF80 MHz_part4_Reverse, 2xNew_partC, 2xHE-LTF80 MHz_part5], wherein 
 2xNew_partA is equal to [1, 0, −1, 0, 1], 2xNew_partB is equal to [0, 1, 0, −1, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, −1, 0, 1, 0, −1, 0, 1, 0], and 2xNew_partC is equal to [−1, 0, 1, 0, 1]; and 
 2xHE-LTF80 MHz_part2_Reverse indicates that 2xHE-LTF80 MHz_part2 is arranged in a reverse order, and 2xHE-LTF80 MHz_part4_Reverse indicates that 2xHE-LTF80 MHz_part4 is arranged in a reverse order, 2xHE-LTF80 MHz_part1 is equal to 2xHE-LTF80 MHz (−500:−259), 2xHE-LTF80 MHz_part2 is equal to 2xHE-LTF80 MHz (−258:−17), 2xHE-LTF80 MHz_part4 is equal to 2xHE-LTF80 MHz (17:258), and 2xHE-LTF80 MHz_part5 is equal to 2xHE-LTF80 MHz (259:500). 
 
     
     
       18. The apparatus according to  claim 16 , wherein the 4xEHT-LTF sequence in the 80 MHz bandwidth is calculated according to the equation:
 4xEHT-LTF80 MHZ [4xHE-LTF80 MHz_part1, 4xNew_partA, 4xHE-LTF80 MHz_part2_Reverse, 4xNew_partB, 4xHE-LTF80 MHz_part4_Reverse, 4xNew_partC, (−1)*4xHE-LTF80 MHz_part5], wherein 
 4xNew_partA is equal to [−1, −1, −1, −1, 1], 4xNew_partB is equal to [1, −1, −1, −1, 1, 1, −1, 1, −1, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, −1, 1, 1], and 4xNew_partC is equal to [−1, 1, −1, 1, −1]; and 
 4xHE-LTF80 MHz_part2_Reverse indicates that 4xHE-LTF80 MHz_part2 is arranged in a reverse order, and 4xHE-LTF80 MHz_part4_Reverse indicates that 4xHE-LTF80 MHz_part4 is arranged in a reverse order, 4xHE-LTF80 MHz_part1 is equal to 4xHE-LTF80 MHz (−500:−259), 4xHE-LTF80 MHz_part2 is equal to 4xHE-LTF80 MHz (−258:−17), 4xHE-LTF80 MHz_part4 is equal to 4xHE-LTF80 MHz (17:258), and 4xHE-LTF80 MHz_part5 is equal to 4xHE-LTF80 MHz (259:500). 
 
     
     
       19. The apparatus according to  claim 16 , wherein the 2xEHT-LTF sequence and the 4xEHT-LTF sequence in an 80 MHz bandwidth are calculated respectively according to the equations:
 2xEHT-LTF80 MHz=[2xHE-LTF80 MHz_part1, 2xHE-LTF80 MHz_part2_Reverse, 2xHE-LTF80 MHz_part3, 2xHE-LTF80 MHz_part4_Reverse, 2xHE-LTF80 MHz_part5]; and 
 4xEHT-LTF80 MHz=[4xHE-LTF80 MHz_part1, 4xHE-LTF80 MHz_part2_Reverse, 4xHE-LTF80 MHz_part3, 4xHE-LTF80 MHz_part4_Reverse, 4xHE-LTF80 MHz_part5], wherein 
 2xHE-LTF80 MHz_part2_Reverse indicates that 2xHE-LTF80 MHz_part2 is arranged in a reverse order, and 2xHE-LTF80 MHz_part4_Reverse indicates that 2xHE-LTF80 MHz_part4 is arranged in a reverse order, 2xHE-LTF80 MHz_part1 is equal to 2xHE-LTF80 MHz (−500:−259), 2xHE-LTF80 MHz_part2 is equal to 2xHE-LTF80 MHz (−258:−12), 2xHE-LTF80 MHz_part3 is equal to 2xHE-LTF80 MHz (−11:11), 2xHE-LTF80 MHz_part4 is equal to 2xHE-LTF80 MHz (12:258), and the 2xHE-LTF80 MHz_part5 is equal to 2xHE-LTF80 MHz (259:500); and 
 4xHE-LTF80 MHz_part2_Reverse indicates that 4xHE-LTF80 MHz_part2 is arranged in a reverse order, and 4xHE-LTF80 MHz_part4_Reverse indicates that 4xHE-LTF80 MHz_part4 is arranged in a reverse order, 4xHE-LTF80 MHz_part1 is equal to 4xHE-LTF80 MHz (−500:−259), 4xHE-LTF80 MHz_part2 is equal to 4xHE-LTF80 MHz (−258:−12), 4xHE-LTF80 MHz_part3 is equal to 4xHE-LTF80 MHz (−11:11), 4xHE-LTF80 MHz_part4 is equal to 4xHE-LTF80 MHz (12:258), and the 4xHE-LTF80 MHz_part5 is equal to 4xHE-LTF80 MHz (259:500). 
 
     
     
       20. The apparatus according to  claim 16 , wherein the 2xEHT-LTF sequence and the 4xEHT-LTF sequence in a 160 MHz bandwidth are calculated respectively according to the equations:
 2xEHT-LTF160 MHz=[2xEHT-LTF80 MHz_part1, 2xEHT-LTF80 MHz_part2, (−1)*2xEHT-LTF80 MHz_part3, (−1)*2xEHT-LTF80 MHz_part4, 0 23 , 2xEHT-LTF80 MHz_part1, 2xEHT-LTF80 MHz_part2, 2xEHT-LTF80 MHz_part3, 2xEHT-LTF80 MHz_part4]; and 
 4xEHT-LTF160 MHz=[4xEHT-LTF80 MHz_part1, 4xEHT-LTF80 MHz_part2, (−1)*4xEHT-LTF80 MHz_part3, 4xEHT-LTF80 MHz_part4, 0 23 , 4xEHT-LTF80 MHz_part1, (−1)*4xEHT-LTF80 MHz_part2, 4xEHT-LTF80 MHz_part3, 4xEHT-LTF80 MHz_part4], wherein 
 2xEHT-LTF80 MHz_part1 is equal to 2xEHT-LTF80 MHz (−500:−257), 2xEHT-LTF80 MHz_part2 is equal to 2xEHT-LTF80 MHz (−256:−1), 2xEHT-LTF80 MHz_part3 is equal to 2xEHT-LTF80 MHz (0:255), and the 2xEHT-LTF80 MHz_part4 is equal to 2xEHT-LTF80 MHz (256:500); and 
 4xEHT-LTF80 MHz_part1 is equal to 4xEHT-LTF80 MHz (−500:−257), 4xEHT-LTF80 MHz_part2 is equal to 4xEHT-LTF80 MHz (−256:−1), 4xEHT-LTF80 MHz_part3 is equal to 4xEHT-LTF80 MHz (0:255), and the 4xEHT-LTF80 MHz_part4 is equal to 4xEHT-LTF80 MHz (256:500).

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